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A variational multiscale framework for atmospheric turbulent flows over complex environmental terrains

机译：在复杂的环境地形上的大气湍流流动分化多尺度框架

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摘要

A residual-based variational multi-scale (VMS) modeling framework is applied to simulate atmospheric flow over complex environmental terrains. The VMS framework is verified and validated using two test cases using linear finite element (FEM) and quadratic non-uniform rational B-spline (NURBS) discretizations. First, the flow over the 3D, axisymmetric Gaussian hill (normally distributed surface) is used to compare the results with FEM and NURBS discretization. Next, the actual terrain of the Bolund hill is used to demonstrate the efficacy of the framework. Good agreement with published data, coming from simulations and field measurements, is achieved, with the NURBS discretization showing much better per-degree-of-freedom accuracy compared with linear FEM. The paper includes a comprehensive review of experimental and numerical methods, and the corresponding challenges, for complex-terrain flows, which provides a proper context for the developments presented in this work. (C) 2020 Elsevier B.V. All rights reserved.
机译：应用基于残余的变分式多尺度（VMS）建模框架来模拟大气流过复杂的环境地形。使用线性有限元（FEM）和二次非均匀RATIONAT B样条（NURBS）离散化，使用两个测试用例进行验证和验证VMS框架。首先，用于3D的流动，轴对称高斯山（常数分布式表面）用于将结果与FEM和NURBS离散化进行比较。接下来，Bolund Hill的实际地形用于展示框架的功效。达到了来自模拟和现场测量的公布数据的良好一致性，NURBS离散化与线性FEM相比显示了更好的每自由度精度。本文包括对复杂地形流量的实验和数值方法的全面审查，以及相应的挑战，为这项工作提供的发展提供了适当的背景。 （c）2020 Elsevier B.v.保留所有权利。

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